202111221 has 8 divisors (see below), whose sum is σ = 290211040. Its totient is φ = 124376112.

The previous prime is 202111213. The next prime is 202111243. The reversal of 202111221 is 122111202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202111221 - 2³ = 202111213 is a prime.

It is a super-2 number, since 2×202111221² = 81697891308221682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202111197 and 202111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202111271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2591131 + ... + 2591208.

It is an arithmetic number, because the mean of its divisors is an integer number (36276380).

Almost surely, 2^202111221 is an apocalyptic number.

It is an amenable number.

202111221 is a deficient number, since it is larger than the sum of its proper divisors (88099819).

202111221 is a wasteful number, since it uses less digits than its factorization.

202111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5182355.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 202111221 is about 14216.5826062384. The cubic root of 202111221 is about 586.8540984208.

Adding to 202111221 its reverse (122111202), we get a palindrome (324222423).

The spelling of 202111221 in words is "two hundred two million, one hundred eleven thousand, two hundred twenty-one".